Method amd device for use in the manufacture of brake shoes



` M. R. DE FRANCE. MET'HOD AND DEVICE'FORUSE IN THE MANUFACTURE OFYBRAKE SHOES. APPLICATION FILED JAN. 16. 19l9.

1,321,897., Patented N0v.18,1919.

2 SHEETSSHEET l,

f3 l: l0

WITNESSES INVENTo/FL IVI. R. DE FRANCE. METHUD AND DEVICE FOR USE IN THE MANUFACTUHE 0F BRAKE SHOES.

APPL|cAT1oN HLED 1AN.16I 1919.

1,321,897, Patented Nov. 18, 1919.

2 SHEETS-SHEET 2.

FIG.E;

26` wrrNEssEs I [o INVENTOR ll h MRFLL F. JDF. FH'E, F BELLEVUE, FENNSYLVMNTA.

Martien ann nnvrcn ron. een in van araivnracrrrrtn or naam-ences.

rateatea not.. i. iai.

Application tiled January 16, 191.9. Serial No. 971,370.

To all whom t may concern.'

Be it known that T, Moment R. Die France',

a citizen of the United States, anda res1-l dent of Bellevue, in the county of Allegheny and State of Pennsylvania, have Vmade a new and useful lnvention in Methodsand Devices for Use in the Manufacture of Brake Shoes, of which the following is a Specifica tion.

This invention relates to brake shoes and more particularly to a method and devices for use in the manufacture of brake Shoes having an inclosing casin either formed of cast or sheet metal and a lling of `frictional material in the casing. Tn two applications filed by nie on January 10, 1918, and June j 22, 1918, and bearing Serial Nos. 211,277'

and 241,415, respectively, ll have disclosed a metal case for composition brake shoes having perforated side walls anda perforated y back, the composition iillin of frictionat llt material being provided wit air channels registering with the perforations of the back and extehding into the filling material.

An object of this invention is to provide a device for use in the manufacture of brake shoes of said applications by means of which the casing will be supported so as to prevent outward distortion thereof during the application of pressure on t-he filling material in compressing it into the casing.`

A further object is to provide a device by means of which the air channels in the filling material may be readily formed and the pressure necessary for compacting the filling material to the desired degree of hardness.

This, as well as other objects which will readily appear to those skilledin this particular art, T attain in the device described in the specification `and illustrated in the drawings accompanying'and forming a part ofV this application 'and throughout the several views of which/,similar elements are denoted by like characters; j

In the drawings Figure 1 is a longitudinal section of a brake shoe casing in the filling of which with frictional material this invention is adapted to beused.

Fig. 2 is a top plan viewof said casing.

Fig. 3 is a longitudinal section of the coinplctcd brake shoe with the lling material in place.

Fig. 4 is a view in cross section ofI the.

shoe shown in Fig. 3.

vice embodying this inventionA with anunfilled casing shown in longitudinaly section in lace therein. i

ig. 6 is-a plan view of the device shown e in Fig. 5 with the presser foot shown in said .bly the presser foot, the presser foot being wn in place. Fig. 8 is a view similar to Fig. t showing a modification of the device of this invention applicable with the modified' form of presser foot shown in this view, and Fig. 9 is an end view of the device.

The device of this invention, 'broadly speaking, comprises a mold havin a base member 9 the top surface ofwhich is shaped to conform to the back 10 of the stamped* or cast metal shell or casing 1l. This support ing face of the base member is provided with a series of projecting pins or hngers 12 which register with openings 13 formed in the back of the casing or shell and these fingers are preferably tapered as shown in the drawings in order that they may be readily withdrawn from the compacted lilling material.. Two end members 14 `and 15 hinged to the base member 9 at 16 and 17 are arranged when in vertical position to contact with the outer surface of the casing ends 18 and to overhang the end walls of the casing and extend outwardly as shown at 1 9 a slight distance over the interior ofthe casing. The lower face of the overhanging portion is chamfered as shown at 20.

Side members 21 and 22' hinged to the base member 9 at 23 and 24 are provided 'with inter-engaging ends 25 and 26, the in* ttl Bti

ice

which is provided with a cam surface 28 t for the purpose of rigidly securing the hinged side members together in operative position.

End members 14 and 15, as well as side members 21 and 22 extend a distance above the top of the brake shoe casing to form a rectangular chamber 28-which serves as a receptacle for the filling materiad 29 in plastic forni and also asa guide for a presser foot 30.

T-he sides 21 and 22, as well as the ends rio to extend a distance above the same-as shown at 32. On account of the chamfered overhanging portions of the form\ the edges of filler 32 are ehamfered as shown in the drawm she frictional material with which the case is filled may consist of iron borings and asbestos held together by means of a binder such as resins or resins and drying oils.

In order to obtain the desired degree of density to the filling material and in order not to waste any of the same just the necessary amount will be placed in the chamber 28 to form the finished brake shoe, and, on account of the curvature of face 33 of the presser foot, the wearing face of therbrake shoe will be given the proper curvature or contour. r

In Fig. 8 I have shown a modified form of presser foot in which the lower face of the same is hollowed out so as to form the necessary chamfered edges to that portion of the filler which projects beyond the brake shoe casing, and, when this form of presser foot is used the inner portions of hinged ends 14 and 15, as well as the inner portions of side walls 21 and 22 will not overhang the brake shoe but will be formed straight as yshown in Fig. 8 to providea guide for the presser foot as well as a receptacle for the plastic filling material. v

The pressure exerted by the lpresser foot of either form will cause the plastic material to 4How evenly throughout the brake shoe casing and through side wall perforations 34 to the confining walls of the mold or form'.

The filling material in this way is caused to completely fill the si-de wall erforations and to extend flush with the .si es of the brake shoe, thus anchoring the filler Within the case. When the filler has been pressed until it. assumes the proper form the presser foot may 'be raised, locking pins 27 removed and the form knocked down so that the shoe may be removed therefrom in finished form.

Pins V12 are slightly tapered s0 as to insure ready removal 'of the finished shoe from.

patent statutes I have described the prin- Vciple of the 0 eration of my invention, to-

gether with t e device which I now conin other ways.'

`for securing said side members together.

Leanser sider to represent the best embodiment thereof, but I desire to have it understood that the device shown is only illustrative and that the invention can be carried out.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is- 1. A device for use in the manufacture of composition 'brake shoes having a'metal case with perforated sides and back, comprising a base having projecting pins or fingers registerin Y with the back perforations, and hinge side and end members for preventing outward distortion of said case.

2. A device for use in the manufacture of composition` brake-shoes havin a metal case with perforated sides and bac comprising a base conforming to 'the back of the case and having projecting pins or fingers regis- 85 tering with the back perforations, .and hinged side and end members for preventing outward: distortion of said case.

3. A device for use in the manufacture of composition brake shoes havin a metal case with perforated sides and bac i, comprising a base serving as a support for the case and having projecting pins or fingers registering with the back perforations, and hinged side and end members for preventing outward distortion of said case.

4. A device for use in the manufacture of composition brake shoes having a metal casewith a perforated back, comprising a base for, supporting a brake shoe case and provided with fingers or pins which project through the perforations in the back of the case, and means for confining the sides of` the case against outward pressure.

5. A device for use in the manufacture of 105 composition brake shoes having a metal case with a perforated back, comprising a base for supporting a brake shoe case and provided with tapered pins or fingers adapted to project through the perforations in the 110 back of the case, and collapsible means for confining the sides of the case against outward pressure. 6. In'a device of the character described,

a base, end members hinged to the base, side 115 members -hinged to the base and adapted when in normal position to interlock and overlap the end members so as to hold said end members in vertical position, and means 7 The combination with a brake shoe case having a perforated back, of a support provided with ingers extending through said perforations, a separable form ori mold for confining the sides and ends ofsaid case against outward distortion, and means for applying pressure to filling material contained in said case.

8. The method of manufacturing composition brake shoes, which consists in formmeteor ing a metal case having perforated sides and a perforated back. in resisting outward distortion of said case by confining` the saine in a mold or forni, in iilling said Case with plastic frictional material, in applying snirient pressure to said material to canse` the same to flow through the side openings of the case and to assume the de sired degree ot hardness and then in removing the finished shoe from said mold or form.

9. The method of manufacturing composition brake shoes, which consists in torming a perforated metal case, in resisting outward distortion of said case, in placing plastic i'iictional material Within the case and then in applying sutoient pressure to said material to cause the saine to flow through the perforations of the ease and to assume the desired degree of hardness.

In testimony whereof, ll have hereunto subscribed my name this 9th day of January, 191,9.

MURRELL R. DE FRANUE. 

